Dynamo-electric machine.



PATENTED OCT. 22. 1907.

M. PFATISGHER.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULYG, 1907.

3 SHEETS-SHEET NmwNLw WITNESSES:

No. 869,102. PATENTED OCT. 22. 1907.

M. PFATISCHER.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULY 5, 1907.

3 SHEETSSHEET -2' FIGI.

No. 869,102. PATENTED OCT. 22. 1907.

v M. PFATISCHER. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULY 5, 1907. I

'2 SHEETS-SHEET 3.

FIGH.

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WITNESSES: INVENTOR:

% J/M \f g f UNITED STATES PATENT OFFICE.

MATHIAS PFATISCHER, OF PHILADELPHIA, PENNSYLVANIA,ASSIGNOR TO ELECTRO DYNAMIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Original application filed July 23. 1906. Serial No. 327.278. Divided and this application filed July 5. 1907. Serial No. 382,189.

Toall whom it may concern:

Be it known that I, MATHIAS PFATISCHER, of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Dynamo Electric Machines, whereof the following is a specification, reference being bad to the accompanying drawings'.

This application is a division of lny application Serial No. 327,278, filed July 23, 1906..

The object of the invention is to provide an improved construction and arrangement of the magnetic circuit of the commutating field, in all those types of dynamoelectric machines in which it is advisable or necessary to create an auxiliary magnetic field for the purpose of effecting good commutation.

1 have illustrated my invention as applied to the type of such machines described in United States Letters Patent No. 775,310, granted to me November 22nd, 1904, but in the present case I have reduced the number of auxiliary poles to one-half the number of main poles, making said auxiliary poles all of the same size and increasing their magnetic strength as compared with machines having the same number of auxiliary poles as main poles, in a mannerwhich is well understood by those skilled in the art.

It is characteristic of my improved construction that the main polar projections and auxiliary polar projections are respectively included in magnetic circuits which are separate and distinct, the magnetic circuit of said auxiliary projections being formed by the latter in conjunction with the iron of the armature.

My invention comprises-the various novel features of construction and arrangement hereinafter more definitely specified.

In the drawings; Figure I, is a longitudinal sectional view of a motor conveniently embodying my improvement. Fig. II, is an elevation of the right hand end of said motor as shown in Fig. I, the shaft bearing bracket and parts connected therewith being omitted. Fig. III, is a diagrammatic view showing the wiring connections of a motor conveniently embodying my improvement.

Referring to Figs. 1, II, and III, the field magnet frame 1, is provided with four main field pole pieces or projections 2, and two auxiliary field pole pieces or 'projections 4, are disposed at top and bottom of said frame 1, to which they are respectively connected by the plates 6. The armature 7, is provided with the shaft 8, and mounted to rotate concentrical with respect to the two series of polar projections 2, and 4, in the bearings 10, in the brackets 11, which are conveniently made separate from said frame 1, and secured to the opposite ends thereof as best shown in Fig. I.

The commutator 12, comprises segments respectively connected with the divisional coils 13, of the armature, and is provided with carbon brushes'l4', and 15, supported by respective brush holders 16, oneof which is indicated in Fig. I. Said brush 14, is connected by the lead 17, with the supply main 18, and said brush 15, is connected by the lead 20, with the single coil 22,

whereby the auxiliary polar projections 4, are energized. Said coil 22, is wound on the tubular core 23, in concentric relation with the armature shaft 8, and in axial alinement with the armature, and, is connected by the lead 24, with the other supply main 25.

The rheostat lever 27, is connected by the lead 17, with said supply main 18, in cooperative relation with the contact points 29, and variable resistance coil 30, and, the lead 32, extends from said coil 30, to the coils 33, which are respectively local to the main polar projections, the last one in the series of said coils 33, being connected by the lead 34, with said supply main 25.

It may be observed that by the arrangement above described, the coils 33, for the main poles 2, are connected in series relation with each other, but in shunt relation with the armature windings 13; whereas the coil 22, for the auxiliary poles 4, is connected in series relation with the armature windings 13.

The direction of rotation of the armature may be determined by the direction of current through said windings 13, and such direction may be reversed by any suitable switch device; for instance, that indicated at 36, in Fig. 111.

The rheostat above described constitutes preferable means for manually varying the strength of the main field of the motor including the polar projections 2, and their coils 33, to weaken said field in correspondence with any desired increase in the number of revolutions of the armature.

In the form of my invention shown in Figs. I, and II, the shaft 8, is provided with a fan wheel 38, between the right hand bearing bracket 11, and the coil'22, so that whenever the armature is rotated, air is circulated with respect to said coils 22, and 33, and maintains them at such a temperature as to permit the operation of the motor with a load considerably greater than is permissible with a motor of ordinary construction.

It is to be understood that I do not desire to limit myself to the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention, as defined in the appended claims.

I claim: I

1. A commutation-pole construction for dynamo-electric machines comprlslng afnagnetiz'ahle structu're having polar projections, so mounted with respect to them-mature that being inclosed by said armature, substantially as set forth.

3. In a dynamo electric machine, the combination with an'armature; of a main field comprising coils provided with main polar projections; an auxiliary field comprising a coil provided with auxiliary polar projections, extending between said main polar projections; said auxiliary coil being disposed in concentric relation with said armature and extending within the latter, substantially as set forth.

4. In a dynamo-electric machine, the combination with an armature; of a main field comprising coils provided with main polar projections; an auxiliary field comprising a concentric coil provided with auxiliary polar projections,

extending between said main polar projections said auxiliary polar projections being all of the same polarity, substantially as set forth. w

5. In a dynamo-electric machine, the combination with an armature; of a main field comprising coils provided with main polar projections; an auxiliary field comprising a coil provided with auxiliary polar projections, extending between said main polar projections; said auxiliary polar projections being diametrically opposed with respect to the armature and being of the same polarity; whereby lines of force of said auxiliary field local to the armature, extend diametrically with respect to the armature axis,

substantially as set forth.

6. In a dynamo-electric machine,-the combination with an armature; of a main field comprising coils provided with main polar projections; an auxiliary field comprising 7 a coil provided with auxiliary polar projections, extending between said main polar projections; said auxiliary polar projections being diametrically opposed with respect to the armature and being of the same polarity; whereby lines of force of said auxiliary field local to the armature,

extend diametrically with respect to said armature, substantially as set forth.

T. In a dynamo-electric machine, the combination with an armature; of a main field comprising coils provided with main polar projections; an auxiliary field comprising a coil provided with auxiliary polar projections, extending between said main polar projections; said auxiliary polar projections being diametrically opposed with respect to the armature and being of the same polarity; whereby lines of force of said auxiliary field local to the armature, extend radially within said armature, substantially as set forth. I

8. In a direct current shunt wound motor, the combination with an armature; of a field magnet frame provided with main polar projections; auxiliary polar pr0- jections all of the same polarity; coils for said main polar projections; a coil common to said auxiliary polar projections, disposed in axial alinemcnt with the armature; means connecting said main coils in shunt relation to the armature windings; and means connecting said auxiliary coil in series relation to the armature windings, substantially as set forth. I

9. In a direct current shunt wound motor, the combination with an armature; of a field magnet frame provided with main polar projections; auxiliary polar projections ofditierent cross sectional area, said auxiliary polar projections being all of the same polarity and form'- ingfin conjunction with the armature iron, a magnetic circuit independent of that-of the main polar projections; a coil common to said auxiliary poles disposed in axial alinement with the armature; means connecting said main coils in shunt relation to the armature windings; means connecting' said auxiliary coil in series relation to the armature windings; and, means arranged to adjustably vary thestrength of the current in said shunt coils, independently of said series coil, substantially as set forth.

In testimony whereof, I have hereunto signedmy name, at Philadelphia, in the State of Pennsylvania, thls-first. day of July, 1907.

MA'lI-IIAS iFA'iflSCilEli.

Witnesses ARTHUR E. PAIGE, Axxx F. Ga'rZrnnAD. 

